Fabric-shearing mechanism



Nov. 15, 1927. v 1,649,172

I A. C. MASON Y A FABRIC SHEARING MECHANISM Filed Jan. 2. 1926 lirios l5, lilith?.

Application led January This invention relates to inechanisni for shearing cloth et the class in which ak rotary cutter cooperates with a ledger blade inthe shearing and 'the ledger blade gtorrns in effect one side or lip of the intake mouth et a suction nozzle which is connected with a suitable source oit suction and serves to reinove the ilutl or cutti trein the cutting line between the rotary cutter and ledger blade. 'lhe object ot the invention is to increase the ellicieney of mechanism oit this class in certain respects which will hereinafter appear.

ln the drawing,

Fig. l shows a vertical sectional vieur of the improved mechanism; and

Fig. Q is an elevation oit the nozz looking toward its mouth.

l. is a channeled cloth support over which extends the cloth A which is to be subjected to the operation ot removine troni its surface by shearing opstanding threads thereon, it being understood that the cloth A is drawn over the support l While the shearing; is proceeding. 'lhe support may be mounted in any Way in a trarne 2. @pposite the channel oi the support l is journaled in suitable bearing nieans on the t 'aine 2 the rotary cutter 3, tie j ieriphcral cuttlir et et which are indicated at 3a, and cooperate with the ledger blade 5 in the known way and as ivill appear.

Suit-ably inounted, also in traine 2, is the nozzle, generally designated by the reference character e. This nozzle has its -intalre opening or mouth elongated lengtl'nvise of the cutter and at one long,- side or lip of such inouth is the ledger blade 5, as usual, the ledger blade projecting troni the nozzle in a plane Which is tangential to the cylindrical path in which the cutting edges 3 ot the cutter travel. ln these mechanisms the 0L- jeet is to cause outside air to pass into the nozzle between the cutter and the ledger blade so as to remove troni the cutting region cud thereupon convey away the ilu'l'l or cuttings, and to this end the suction is calculated to act to best ellect it air is otherwise excluded, to which, end the hun,r side ot the nozzle inouth opposite the lip 'formed by the ledger blade is placed close to the cylindrical path of the cutter edges 3 and ailiords a surtace, as 6, conforming; with or paralleling said path to more or less extent, whereby air iinpelled outwardly and against such side et the nozzle mouth by the cutter blades will serve to resist the inflow ot atmospheric air 2, 1926. Serial llo. 78,779.

and the consequent reduction oi' suction at the cutting point. W ith this in View l construct the nozzle in the following novel Way: The bodyv l ot the nozzle has the Vtorni oi" a cone, flattened, thus producing` the mentioned elone'ated mouth 7u; its outlet end is tubular or substantially so, as at 8. (ln practice the nozzle and ledger blade are separate part-s secured together by screws as 9, and for the attachment ott the blade to the nozzle in proper position the edge portion of the nozzle at its niouth is thickened up, as at 7b, and provided with a fiat exterior surface against which the blade bears.) it the side of the P nozzle mouth 7a opposite the ledger blade Wall 7C ot' nozzle body 7 approaches quite close to the cylindrical path in which the cutter edges 3 travel, and it has as anlintegral projection thereof the baille l0. This baille projects outwardly roin said Wall and it has adjoining the cutter the mentioned surface (l, ior more or less extent conforming,- with or parallel to the said cylindrical path oi the cutting; `edges 3a. rlhe baille l0 and the opposite side of the mouth 7a together form a recess in which the cutter 3 is arranged.

Thus have constructed the nozzle for eftleient exclusion oi' air ezeccpt at the cut ting edge. But l havethese further ad vantages: lleretoiiore, the part corresponding,l to nay baille lO projected inwardly, or oppositely to the direction herein actually shown. ln the lli-st place, this produced e. pocket in which the iiutf collected, swirlingy around in ainass which finally grew to such dimensions as to cut ott1 the passage through the nozzle entirely, so that the nozzle required to be removed and cleaned. Secondly, it was practically impossible to cest the noz zle When so formed so that the inner edge oit the baille would not, as a consequence ot warping, be wavy, and if so it was then very diilicult to inachine it so that its surface 6 would be truly parallel With the cylindrical path oi the cutter cdpges 3, By lorniing;` the baille as l have described the nozzle not only alliords a passage troni its mouth to its discharge end without any cavity in which swirling;` or cddyinp; may be set up but that side oit the niouth 7 which has the surface 6 is at the critical point- (i. e., where the surface G exists) reinforced or supported directly by the body of the nozzle, or more `specifically its Wall 7, and in forming the nozzle casting that particular part is not distorted. by warpino',

Another feature of my invention consists in providing a nozzle which while having the form of a flattened cone, as a'lready described, affords a passage which tapers downward from the neck to the mouth or inlet in any section passing through bot-l1 the neck and the body which traverses the lesser width of the body portion, whereby the passage is devoid of any factor whatever tending to obstruct. the material being drawn from the cutting point.

The part 1l is a. flexible strip commonly used in these machines both as a guard for the cutter and to hone the cutting edges 3 thereof; it may be attached as shown to the baille 10 so as to depend therefrom in contact with the cutter edges 3.

Having thus fully described my invention what I claim and desire to secure by Letters Patent is:

In a. fabric shearing machine, a suction nozzle formed as an integral casting and with a flattened conical bodyportion and with a neck portion in which thc body portion discharges, the larger end of said body portion having an opening forming the nozzle inlet and extending approximately entire-ly across said body portion longitudinally of its greater width and said neck portion forming the outlet of the nozzle, one side of the body portion at one long side of said mouth having a balic also extending across said body portion longitudinally of its greater width and projecting exteriorly therefrom in a p'lane :leute (o that of the other side and thereby forming a recess to receive a rotary cutter adapted to coact with a ledger blade to form a cutting means and having its axis substantially parallel with the long side of said mouth.

In testimony whereof I alix my signature.

ARTHUR C. MASON. 

